期刊
PROGRESS IN ORGANIC COATINGS
卷 163, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2021.106638
关键词
Controllability; Isocyanate; Encapsulation; Storage stability; Self-healing behavior
资金
- Major Research & Development Project in Shanxi Province [201903D121104]
- Major Science & Technology Project of Shanxi Province [20181101012]
- Shanxi Province Science Foundation for Youths [201901D211586]
- National Natural Science Foun-dation of China [52003286]
Isophorone diisocyanate (IPDI) microcapsules with silica/polyurea hybrid shells were successfully synthesized using interfacial and in situ polymerization. These microcapsules exhibited excellent thermal stability and scratch self-healing properties when incorporated into epoxy resin coatings.
Isophorone diisocyanate (IPDI) microcapsules with silica/polyurea hybrid shells were successfully synthesized via interfacial polymerization and in situ polymerization in an oil/water emulsification system. The micromorphology and surface silicon species-modified microcapsules were studied by scanning electron microscopy and X-ray photoelectron spectroscopy. The components of the microcapsules were analysed by Fourier transform infrared spectroscopy. The resultant microcapsules have diameters of 76.5 +/- 16.5 mu m, shell thicknesses of approximately 2.3 mu m, and core fractions of 76.5 wt%. Meanwhile, the thermal stability, storage stability and solvent resistance of the microcapsules were evaluated. The results showed that silica/polyurea microcapsules had excellent thermal stability with the initial decomposition temperature, increasing by approximately 92 degrees C compared with that of polyurea microcapsules. More than 65.0 wt% active core fraction of silica-modified microcapsules was reserved after six months in air or 40 days in water. The microcapsules were incorporated into epoxy resin coatings. The scratch and self-healing test of the coatings proved that the silica-modified microcapsules healed the scratch successfully.
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